how old ___ your sister and your brother谓语动词填什么?

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how old ___ your sister and your brother谓语动词填什么?

how old ___ your sister and your brother谓语动词填什么?
how old ___ your sister and your brother谓语动词填什么?

how old ___ your sister and your brother谓语动词填什么?
are两个人,要复数

are

are
How old are your sister and your brother?

are.
【解释】后面有your sister, your brother,
是两个人以上,用be的复数形式,即are. 否则用is.
其实套用一下how old are you? 就可以了~